Rebrickable is described as 'Will show you which LEGO sets you can build from the sets and parts you already own. You can choose from official LEGO sets or thousands of MOCs (My Own Creations) submitted by hundreds of designers. All MOCs include building instructions and full parts lists' and is an website. There are four alternatives to Rebrickable, not only websites but also apps for Android and Windows. The best Rebrickable alternative is Brickzip, which is free. Other great sites and apps similar to Rebrickable are Brickset, Basebrick and brickDB.io.
Brickzip is a meeting point for LEGO fans from all over the world, where you can find out about the latest news, events, talk, share and meet people with similar interests within LEGO.
Brickset.com was launched in 1997 to keep track of the many promotional sets that were appearing at that time. Since then it has expanded considerably and is now the primary reference on LEGO sets on the internet.
BrickDB.io is a comprehensive LEGO® database offering detailed information on sets, parts, and minifigures for enthusiasts and builders.
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You don't have limits on how many sets you can add